package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandle.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;


/**
 * Created by Miracle yaochengwei on 2020/8/8 20:23
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //因为SubjectExcelListener，不能交给spring、管理 需要自己new，不能注入其他对象
    //不能实现数据库操作  //手动注入方法
    public EduSubjectService subjectService;
    public SubjectExcelListener() {} //无参
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }
    //读取excel内容，一行一行进行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null) {
            throw new GuliException(20001,"文件数据为空");
        }
        //一行行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(existOneSubject == null) { //没有相同一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");//父类id为0
            existOneSubject.setTitle(subjectData.getOneSubjectName());//一级分类名称
            subjectService.save(existOneSubject);//这个里面添加的方法叫save /最后把名字对象放里面
        }
        //获取一级分类的id值 如果，这个值不等于空，就有值，id，如果为空，添加后，也有id
        String pid = existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if(existTwoSubject == null) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);//父类id为0
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//二级分类名称
            subjectService.save(existTwoSubject);
        }
    }
    //判断一级分类，不能重复添加
    //EduSubjectService subjectService为了操作数据库
    private EduSubject existOneSubject(EduSubjectService subjectService,String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);//判断名字是否相同
        wrapper.eq("parent_id","0");//parent_id等于0
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    //判断二级分类不能重复添加  /subjectService传这个，为了能做，增删，改查操作，不传，没法调，因为没交给spring管理
    //如果表里存在名称一级分类就不加  没有就添加
    //就是再前端下面你有一个vue就不能，再有一个vue
    //根据插叙你，看里面有没有相同的一级和二级分类
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper); //最终返回这个对象
        return twoSubject;
    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}